How does one make a new character with say a Bounty Hunter: Gadgeteer and a Technician: Outlaw Tech ? If not as starter how early after game-play experience gain?
Starter character with two classes?
You'd only be able to choose one career. So you'd have to choose to start either as a Bounty Hunter (with Gadgeteer as your first Specialization) or Technician (with Outlaw Tech as your first specialization). From there, you can spend 30xp to buy Gadgeteer/Outlaw Tech as a second specialization. This can be spent in character creation (but keep in mind it dips into your starting xp that is the only way you can buy characteristic increases directly) or after you've gotten enough xp after character creation.
You can find the specific details on buying new specializations on pg. 93 of the EotE core.